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LLE10084 : Howto watch the execution of a program periodically

Symptom:

You need to watch the execution of a command line programm and see it change

Cause:

none

Solution:

You can use the watch command to do the job. Which watch you can execute a command at a certain time interval and make it show the differences in the output.

e.g.

To see the contents of a directory change you can use:

watch -d ls -l

You stop the output with Ctrl-C

Here we watch the disk space and see it shrink during a big filecopy. We run the command every 30 seconds.

watch -n 30 df -h 

There are lots of ways to use the watch command. Just try a few out. 

 


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